Just found this forum and thank you in advance for your help.
First my problem started out as a stupid mistake. I travel and my wife let the propane tank go empty. Sunday night guess what no heat. I called the service company who came in replaced the valve, said it was leaking as they smelled gas, replaced the sensor said my was bad, replaced the drain hose, then told me I was out of gas.
Now the furnace will not light up everytime. It goes on a time or two then will not light and just runs the blower. I have to go power down the furnace, then it seems to work for a while.
I am getting a two flash code which reads external lockout. Any suggestions or help. Did I just get taken for 479 bucks?